string replacement changed to incorrect regex replacement

[pne]

I saw that from 2.7 (r10049) to 2.7.1 (r10482), wp-admin/link-manager.php changed by turning

str_replace('www.', '', $short_url)

into

preg_replace('/^www./i', '', $short_url)

I think that the regex should be

/^www\./i

with a backslash before the dot, since dot is special in regexes ('match any character'), which is probably not what is intended here.

[automattor]

(In [10717]) Escape dot in regex. Props pne, sivel. fixes #9088 for trunk

[ryan]

(In [10718]) Escape dot in regex. Props pne, sivel. fixes #9088 for 2.7